On the one hand, if the person you're chatting with shares the same fantasy as you and s/he is holding up her/his end of the chat, what difference does it make if it's a man, woman or artificial intelligence machine? (The Turing test is the name given to a test where the person administering the test is supposed to distinguish between a human and a computer by asking questions and receiving written responses.)
On the other hand, it sucks to think you have some basis for connection and then to find out you've been played. See more and a couple tricks for detecting fakers and posers, below the break.